Recent answers to In which version we have Win8 App?https://support.mozilla.org/en-US/questions/9483572013-01-25T10:25:37-08:00The current release version of Firefox is compatible with Windows 8, it will run as a desktop applic2013-01-25T10:25:37-08:00TonyEhttps://support.mozilla.org/en-US/questions/948357#answer-401706

The current release version of Firefox is compatible with Windows 8, it will run as a desktop application and not as a Metro app.

Mozilla are developing a version of Firefox that can be run as either a desktop application or a Metro app but it is still someway from release. I am not aware of any target release date.